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tonic acid anions.

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HEIlllEtICH H021, 'WllliLTlilR BEENUULLI, AND ARTHUR LINK, 02F BASEL, SW'I'IZERLAND, AQSIGNQlEtEl TU SOCIETY T. R. GEEIG'Y S. A., 01 BAKEL, SWITZERLAND.

PRUGESS @IE EDYEING AND PRDTTING- .lrCETYL-CELL'ULOSE.

No Drawing. Application filed March 5, 1924, Serial No. 697,145, and in Germany March 31. 1923.

ponifying alkalis or of organic solvents, or

through too high a temperature in dyeing, the acetyl-cellulose. is prejudicially altered, so that its valuable qualities are reduced or entirely destroyed.

lit has now been discovered that with a large number of dyestuffs, which by themselves have only a weak afiinity for acetylcellulose, these disadvantages canhe avoided in producing the dyeing and printing of acetyl-cellulose in the presence of aryl-sul- 'llhis etlec't can be obtained by the addition to a dye bath or printing paste of aryl-sulfonic acid compounds of any kind, in the form of free acids or salts, the dyestuffs being thus brought into a form in which they are taken up'by the fibre at a relatively low temperature, which is quite harmless to the acetyl-cellulose In this case it may be advantageous to add to the bath or paste protective colloids such as glue, gelatine, glucose, hast soap or the like, particularly with dyes which show a tendency to precipitate on the addition of organic acids.

instead of adding aryleulltonic acid compounds to a dye bath or printing paste, the ecetylcellulose can be previously treated with such compounds alone and afterwards, it necessary with the addition of protective colloids, dyed or printed as usual. with a fresh or old bath, the essential feature being always the production of the dyeing and printing in the presence of aryl-suli onic acid anions. The following acid compounds in the form all :lree acids or salts have shown themselves among others, as suitable additions: the sullionic acids or locnzol, naphthalene and anthraquinone. and their deriva tives substituted by one or more oXy-, allryl, chloro-, or nitrdgroups;

The particular worhing method is shown by the following examples,

For dyeing,

' during Which the ratio of fibre to solutions is NH; I 4% of gelatine and 2% of ,B-naphthalenesulfonic acid are used in the, same Way as Jxample 1. Ratio of fibre to solution 1:60;

Example 3.-1% of pyronine G having the formula asis and 1% of sodiurn-fl-anthroqrunone-monosullonate are used in the same way as in Example l. Rat o of libreto solution 1:30.

B. For printing".

v ill dissolved in 5 parts of acetic acid oil 30% strength, and 10 parts of waterto which is added 34 parts of l :l gum tlnclreningo The ill) dye pasteso made is printed, steamed and Washed as usual.

Example 5.2 parts of sodium-l-c'hlorolnaphthalene-sulfonate are dissolved in 98 parts of water. The dry acetyl-cellulose is .tyl-cellulose, consisting in adding'to the dyesaturated with this padding solution and after drying printed with a dye paste which is made by dissolving 1 part of crystallized malachite green in 4 parts of acetic acid of 80% strength and 25 parts of water, and

- stirring in 70 parts of 1:1.gum thickening.

Steaming and washing are afterwards eliect-- I ed as usual.

What We I claim is:

tyl-cellulose, 'consisting in producing the dyeing and printing of finished acetyl-cellulose with coloring matters in the presence of aryl-sulfonic acid anions. I I

2. A process for dyeing and printing aceing and printing mass an aryl-sulfonic acid compound and in then treating finished acetyl-cellulose With the mass thus prepared In witness whereof we have hereunto signed our names this 9th day HEINRICH HOZ. WALTER BERNOULLL; ARTHUR LINK.

of February 

